Science Daily  December 7, 2020 Pre-industrial aerosol concentration and composition particles formed directly in the atmosphere from gaseous precursors, constitutes a large uncertainty in the anthropogenic radiative forcing. From their observations taken at the remote Nepal Climate Observatory Pyramid station at 5,079 m above sea level an international team of researchers (Finland, Italy, Switzerland, France, Estonia, USA – industry) shows that up-valley winds funnel gaseous aerosol precursors to higher altitudes. During this transport, these are oxidized into compounds of very low volatility, which rapidly form many aerosol particles. These are transported into the free troposphere, suggesting that the whole Himalayan region […]